MICROSTRUCTURE AND ELEMENT DISTRIBUTIONS OF CERAMIC-LIKE COATINGS ON THE AZ91 ALLOY BY MICRO-ARC OXIDATION

Chuanzhong Chen (), Qing Dong and Diangang Wang
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Chuanzhong Chen: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China
Qing Dong: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China
Diangang Wang: School of Materials Science and Engineering, Shandong University, Shandong Ji'nan 250061, P. R. China

Surface Review and Letters (SRL), 2006, vol. 13, issue 01, 63-68

Abstract: Ceramic-like coatings were deposited on the substrate of the AZ91 alloy by micro-arc oxidation (MAO). Many methods like X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron diffraction spectroscopy (EDS) were used to analyze the structure and composition of the coating. XRD showed that the MAO coating was mainly composed ofMgO. The results of SEM showed that the coating surface possessed a porous microstructure and the pore size was in the range of 1–3 μm. EDS indicated that the coating matrix was relatively dense and had a homogeneous thickness. The element silicon from the applied electrolyte could be absorbed into the coating in the MAO process. The hardness of theMgOcoatings could reach 513 HV0.025that was about four times higher than that of the substrate. It is expected that the coatings have a great potential in the surface protection of magnesium alloys.

Keywords: Micro-arc oxidation; phase component; morphology; the AZ91 alloy (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1142/S0218625X06007846

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